Update:
Except from trying to contact Shlomo and maybe Offer and ask if they are interested or even into that kind of further development, I don't see anything that could help you right now. It seems the module wasn't meant to do what you need.

Or if you want to build your own routines, Rex A. Dwyer gives a gentle introduction on suffix trees in Chapter 12 (esp. pp. 177--193) of Genomic Perl using the word banana and not some DNA or RNA as one might fear.